Yesterday, it was announced that a team of astronomers using data from the
WISE space telescope have discovered 100 new, nearby (all within 40ly) brown dwarfs, including 6 of Class Y type. The nearest of these, WISE 1541-2250, is only 9 light years away. The coldest, WISE 1828+2650, is in Lyra and its surface temperature is only 25 degrees C. The team expect many more are to be found in close proximity to the Solar System.
WISE 1541-2250 has become the 7th closest star to our Solar System, nudging Ross 154 back to 8th.